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powerpc/32s: Make pte_update() non atomic on 603 core

Browse source 
On 603 core, TLB miss handler don't do any change to the
page tables so pte_update() doesn't need to be atomic.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/cc89d3c11fc9c742d0df3454a657a3a00be24046.1643538554.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-01-30 10:29:34 +00:00 committed by Michael Ellerman
parent 535bda36db
commit 4291d085b0
1 changed files with 22 additions and 15 deletions
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37
arch/powerpc/include/asm/book3s/32/pgtable.h
View file

@ -298,28 +298,35 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
unsigned long clr, unsigned long set, int huge)
{
pte_basic_t old;
unsigned long tmp;
__asm__ __volatile__(
if (mmu_has_feature(MMU_FTR_HPTE_TABLE)) {
unsigned long tmp;
asm volatile(
#ifndef CONFIG_PTE_64BIT
"1: lwarx %0, 0, %3\n"
" andc %1, %0, %4\n"
"1: lwarx %0, 0, %3\n"
" andc %1, %0, %4\n"
#else
"1: lwarx %L0, 0, %3\n"
" lwz %0, -4(%3)\n"
" andc %1, %L0, %4\n"
"1: lwarx %L0, 0, %3\n"
" lwz %0, -4(%3)\n"
" andc %1, %L0, %4\n"
#endif
" or %1, %1, %5\n"
" stwcx. %1, 0, %3\n"
" bne- 1b"
: "=&r" (old), "=&r" (tmp), "=m" (*p)
" or %1, %1, %5\n"
" stwcx. %1, 0, %3\n"
" bne- 1b"
: "=&r" (old), "=&r" (tmp), "=m" (*p)
#ifndef CONFIG_PTE_64BIT
: "r" (p),
: "r" (p),
#else
: "b" ((unsigned long)(p) + 4),
: "b" ((unsigned long)(p) + 4),
#endif
"r" (clr), "r" (set), "m" (*p)
: "cc" );
"r" (clr), "r" (set), "m" (*p)
: "cc" );
} else {
old = pte_val(*p);
*p = __pte((old & ~(pte_basic_t)clr) | set);
}
return old;
}