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powerpc/futex: Use masked user access

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Commit 861574d51b ("powerpc/uaccess: Implement masked user access")
provides optimised user access by avoiding the cost of access_ok().

Use masked user access in arch_futex_atomic_op_inuser()

Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/e29f6a5c14e5938df68d94bfac6b2f762fb922aa.1773136636.git.chleroy@kernel.org
This commit is contained in:
Christophe Leroy (CS GROUP)
2026-03-10 10:59:58 +01:00
committed by Madhavan Srinivasan
parent f26ad12356
commit 40a1b9d044
1 changed files with 2 additions and 4 deletions
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6
arch/powerpc/include/asm/futex.h
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@@ -33,8 +33,7 @@ static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
{
int oldval = 0, ret;
if (!user_access_begin(uaddr, sizeof(u32)))
return -EFAULT;
uaddr = masked_user_access_begin(uaddr);
switch (op) {
case FUTEX_OP_SET:
@@ -69,8 +68,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
int ret = 0;
u32 prev;
if (!user_access_begin(uaddr, sizeof(u32)))
return -EFAULT;
uaddr = masked_user_access_begin(uaddr);
__asm__ __volatile__ (
PPC_ATOMIC_ENTRY_BARRIER