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powerpc/ftrace: Minimise number of #ifdefs

Browse source 
A lot of #ifdefs can be replaced by IS_ENABLED()

Do so.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Fold in changes suggested by Naveen and Christophe on list]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/18ce6708d6f8c71d87436f9c6019f04df4125128.1652074503.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-05-09 07:36:17 +02:00 committed by Michael Ellerman
parent b97d0e3dcf
commit af8b9f352f
3 changed files with 85 additions and 94 deletions
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2
arch/powerpc/include/asm/code-patching.h
View file

@ -219,7 +219,6 @@ static inline unsigned long ppc_kallsyms_lookup_name(const char *name)
return addr;
}
#ifdef CONFIG_PPC64
/*
* Some instruction encodings commonly used in dynamic ftracing
* and function live patching.
@ -236,6 +235,5 @@ static inline unsigned long ppc_kallsyms_lookup_name(const char *name)
/* usually preceded by a mflr r0 */
#define PPC_INST_STD_LR PPC_RAW_STD(_R0, _R1, PPC_LR_STKOFF)
#endif /* CONFIG_PPC64 */
#endif /* _ASM_POWERPC_CODE_PATCHING_H */

2
arch/powerpc/include/asm/module.h
View file

@ -41,9 +41,7 @@ struct mod_arch_specific {
#ifdef CONFIG_DYNAMIC_FTRACE
unsigned long tramp;
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
unsigned long tramp_regs;
#endif
#endif
/* List of BUG addresses, source line numbers and filenames */

175
arch/powerpc/kernel/trace/ftrace.c
View file

@ -150,26 +150,39 @@ __ftrace_make_nop(struct module *mod,
return -EINVAL;
}
/* When using -mprofile-kernel or PPC32 there is no load to jump over */
pop = ppc_inst(PPC_RAW_NOP());
if (IS_ENABLED(CONFIG_MPROFILE_KERNEL)) {
if (copy_inst_from_kernel_nofault(&op, (void *)(ip - 4))) {
pr_err("Fetching instruction at %lx failed.\n", ip - 4);
return -EFAULT;
}
#ifdef CONFIG_PPC64
#ifdef CONFIG_MPROFILE_KERNEL
if (copy_inst_from_kernel_nofault(&op, (void *)(ip - 4))) {
pr_err("Fetching instruction at %lx failed.\n", ip - 4);
return -EFAULT;
/* We expect either a mflr r0, or a std r0, LRSAVE(r1) */
if (!ppc_inst_equal(op, ppc_inst(PPC_RAW_MFLR(_R0))) &&
!ppc_inst_equal(op, ppc_inst(PPC_INST_STD_LR))) {
pr_err("Unexpected instruction %s around bl _mcount\n",
ppc_inst_as_str(op));
return -EINVAL;
}
} else if (IS_ENABLED(CONFIG_PPC64)) {
/*
* Check what is in the next instruction. We can see ld r2,40(r1), but
* on first pass after boot we will see mflr r0.
*/
if (copy_inst_from_kernel_nofault(&op, (void *)(ip + 4))) {
pr_err("Fetching op failed.\n");
return -EFAULT;
}
if (!ppc_inst_equal(op, ppc_inst(PPC_INST_LD_TOC))) {
pr_err("Expected %08lx found %s\n", PPC_INST_LD_TOC, ppc_inst_as_str(op));
return -EINVAL;
}
}
/* We expect either a mflr r0, or a std r0, LRSAVE(r1) */
if (!ppc_inst_equal(op, ppc_inst(PPC_RAW_MFLR(_R0))) &&
!ppc_inst_equal(op, ppc_inst(PPC_INST_STD_LR))) {
pr_err("Unexpected instruction %s around bl _mcount\n",
ppc_inst_as_str(op));
return -EINVAL;
}
#else
/*
* Our original call site looks like:
* When using -mprofile-kernel or PPC32 there is no load to jump over.
*
* Otherwise our original call site looks like:
*
* bl <tramp>
* ld r2,XX(r1)
@ -181,24 +194,10 @@ __ftrace_make_nop(struct module *mod,
*
* Use a b +8 to jump over the load.
*/
pop = ppc_inst(PPC_RAW_BRANCH(8)); /* b +8 */
/*
* Check what is in the next instruction. We can see ld r2,40(r1), but
* on first pass after boot we will see mflr r0.
*/
if (copy_inst_from_kernel_nofault(&op, (void *)(ip + 4))) {
pr_err("Fetching op failed.\n");
return -EFAULT;
}
if (!ppc_inst_equal(op, ppc_inst(PPC_INST_LD_TOC))) {
pr_err("Expected %08lx found %s\n", PPC_INST_LD_TOC, ppc_inst_as_str(op));
return -EINVAL;
}
#endif /* CONFIG_MPROFILE_KERNEL */
#endif /* PPC64 */
if (IS_ENABLED(CONFIG_MPROFILE_KERNEL) || IS_ENABLED(CONFIG_PPC32))
pop = ppc_inst(PPC_RAW_NOP());
else
pop = ppc_inst(PPC_RAW_BRANCH(8)); /* b +8 */
if (patch_instruction((u32 *)ip, pop)) {
pr_err("Patching NOP failed.\n");
@ -207,6 +206,11 @@ __ftrace_make_nop(struct module *mod,
return 0;
}
#else
static int __ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr)
{
return 0;
}
#endif /* CONFIG_MODULES */
static unsigned long find_ftrace_tramp(unsigned long ip)
@ -279,11 +283,11 @@ static int setup_mcount_compiler_tramp(unsigned long tramp)
}
/* Let's re-write the tramp to go to ftrace_[regs_]caller */
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
ptr = ppc_global_function_entry((void *)ftrace_regs_caller);
#else
ptr = ppc_global_function_entry((void *)ftrace_caller);
#endif
if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
ptr = ppc_global_function_entry((void *)ftrace_regs_caller);
else
ptr = ppc_global_function_entry((void *)ftrace_caller);
if (patch_branch((u32 *)tramp, ptr, 0)) {
pr_debug("REL24 out of range!\n");
return -1;
@ -352,10 +356,12 @@ int ftrace_make_nop(struct module *mod,
old = ftrace_call_replace(ip, addr, 1);
new = ppc_inst(PPC_RAW_NOP());
return ftrace_modify_code(ip, old, new);
} else if (core_kernel_text(ip))
} else if (core_kernel_text(ip)) {
return __ftrace_make_nop_kernel(rec, addr);
} else if (!IS_ENABLED(CONFIG_MODULES)) {
return -EINVAL;
}
#ifdef CONFIG_MODULES
/*
* Out of range jumps are called from modules.
* We should either already have a pointer to the module
@ -378,10 +384,6 @@ int ftrace_make_nop(struct module *mod,
mod = rec->arch.mod;
return __ftrace_make_nop(mod, rec, addr);
#else
/* We should not get here without modules */
return -EINVAL;
#endif /* CONFIG_MODULES */
}
#ifdef CONFIG_MODULES
@ -411,10 +413,9 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
if (copy_inst_from_kernel_nofault(op, ip))
return -EFAULT;
#ifdef CONFIG_PPC64_ELF_ABI_V1
if (copy_inst_from_kernel_nofault(op + 1, ip + 4))
if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V1) &&
copy_inst_from_kernel_nofault(op + 1, ip + 4))
return -EFAULT;
#endif
if (!expected_nop_sequence(ip, op[0], op[1])) {
pr_err("Unexpected call sequence at %p: %s %s\n",
@ -423,20 +424,15 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
}
/* If we never set up ftrace trampoline(s), then bail */
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
if (!mod->arch.tramp || !mod->arch.tramp_regs) {
#else
if (!mod->arch.tramp) {
#endif
if (!mod->arch.tramp ||
(IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) && !mod->arch.tramp_regs)) {
pr_err("No ftrace trampoline\n");
return -EINVAL;
}
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
if (rec->flags & FTRACE_FL_REGS)
if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) && rec->flags & FTRACE_FL_REGS)
tramp = mod->arch.tramp_regs;
else
#endif
tramp = mod->arch.tramp;
if (module_trampoline_target(mod, tramp, &ptr)) {
@ -460,6 +456,11 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
return 0;
}
#else
static int __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
{
return 0;
}
#endif /* CONFIG_MODULES */
static int __ftrace_make_call_kernel(struct dyn_ftrace *rec, unsigned long addr)
@ -472,16 +473,12 @@ static int __ftrace_make_call_kernel(struct dyn_ftrace *rec, unsigned long addr)
entry = ppc_global_function_entry((void *)ftrace_caller);
ptr = ppc_global_function_entry((void *)addr);
if (ptr != entry) {
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
if (ptr != entry && IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
entry = ppc_global_function_entry((void *)ftrace_regs_caller);
if (ptr != entry) {
#endif
pr_err("Unknown ftrace addr to patch: %ps\n", (void *)ptr);
return -EINVAL;
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
}
#endif
if (ptr != entry) {
pr_err("Unknown ftrace addr to patch: %ps\n", (void *)ptr);
return -EINVAL;
}
/* Make sure we have a nop */
@ -524,10 +521,13 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
old = ppc_inst(PPC_RAW_NOP());
new = ftrace_call_replace(ip, addr, 1);
return ftrace_modify_code(ip, old, new);
} else if (core_kernel_text(ip))
} else if (core_kernel_text(ip)) {
return __ftrace_make_call_kernel(rec, addr);
} else if (!IS_ENABLED(CONFIG_MODULES)) {
/* We should not get here without modules */
return -EINVAL;
}
#ifdef CONFIG_MODULES
/*
* Out of range jumps are called from modules.
* Being that we are converting from nop, it had better
@ -539,10 +539,6 @@ int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
}
return __ftrace_make_call(rec, addr);
#else
/* We should not get here without modules */
return -EINVAL;
#endif /* CONFIG_MODULES */
}
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
@ -633,6 +629,11 @@ __ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
return 0;
}
#else
static int __ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr)
{
return 0;
}
#endif
int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
@ -657,9 +658,11 @@ int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
* variant, so there is nothing to do here
*/
return 0;
} else if (!IS_ENABLED(CONFIG_MODULES)) {
/* We should not get here without modules */
return -EINVAL;
}
#ifdef CONFIG_MODULES
/*
* Out of range jumps are called from modules.
*/
@ -669,10 +672,6 @@ int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
}
return __ftrace_modify_call(rec, old_addr, addr);
#else
/* We should not get here without modules */
return -EINVAL;
#endif /* CONFIG_MODULES */
}
#endif
@ -686,15 +685,13 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
new = ftrace_call_replace(ip, (unsigned long)func, 1);
ret = ftrace_modify_code(ip, old, new);
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
/* Also update the regs callback function */
if (!ret) {
if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS) && !ret) {
ip = (unsigned long)(&ftrace_regs_call);
old = ppc_inst_read((u32 *)&ftrace_regs_call);
new = ftrace_call_replace(ip, (unsigned long)func, 1);
ret = ftrace_modify_code(ip, old, new);
}
#endif
return ret;
}
@ -724,12 +721,15 @@ int __init ftrace_dyn_arch_init(void)
PPC_RAW_MTCTR(_R12),
PPC_RAW_BCTR()
};
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
unsigned long addr = ppc_global_function_entry((void *)ftrace_regs_caller);
#else
unsigned long addr = ppc_global_function_entry((void *)ftrace_caller);
#endif
long reladdr = addr - kernel_toc_addr();
unsigned long addr;
long reladdr;
if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
addr = ppc_global_function_entry((void *)ftrace_regs_caller);
else
addr = ppc_global_function_entry((void *)ftrace_caller);
reladdr = addr - kernel_toc_addr();
if (reladdr >= SZ_2G || reladdr < -(long)SZ_2G) {
pr_err("Address of %ps out of range of kernel_toc.\n",
@ -746,11 +746,6 @@ int __init ftrace_dyn_arch_init(void)
return 0;
}
#else
int __init ftrace_dyn_arch_init(void)
{
return 0;
}
#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER