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samples/hw_breakpoint: fix building without module unloading 

[ Upstream commit b9080468ca ]

__symbol_put() is really meant as an internal helper and is not available
when module unloading is disabled, unlike the previously used symbol_put():

samples/hw_breakpoint/data_breakpoint.c: In function 'hw_break_module_exit':
samples/hw_breakpoint/data_breakpoint.c:73:9: error: implicit declaration of function '__symbol_put'; did you mean '__symbol_get'? [-Werror=implicit-function-declaration]

The hw_break_module_exit() function is not actually used when module
unloading is disabled, but it still causes the build failure for an
undefined identifier. Enclose this one call in an appropriate #ifdef to
clarify what the requirement is. Leaving out the entire exit function
would also work but feels less clar in this case.

Fixes: 910e230d5f ("samples/hw_breakpoint: Fix kernel BUG 'invalid opcode: 0000'")
Fixes: d8a84d33a4 ("samples/hw_breakpoint: drop use of kallsyms_lookup_name()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Arnd Bergmann 2023-07-25 10:25:36 +02:00 committed by Greg Kroah-Hartman
parent 58787ff3d0
commit abdfde0377
1 changed files with 2 additions and 0 deletions
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2
samples/hw_breakpoint/data_breakpoint.c
View File

@ -70,7 +70,9 @@ fail:
static void __exit hw_break_module_exit(void)
{
unregister_wide_hw_breakpoint(sample_hbp);
#ifdef CONFIG_MODULE_UNLOAD
__symbol_put(ksym_name);
#endif
printk(KERN_INFO "HW Breakpoint for %s write uninstalled\n", ksym_name);
}