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| author | Nicholas Piggin <npiggin@gmail.com> | 2016-11-23 14:02:07 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-11-28 12:32:29 +0100 |
| commit | f87f253bac3ce4a4eb2a60a1ae604d74e65f9042 (patch) | |
| tree | f90844c323d24e27c08c113beaffd318f004c243 /arch/powerpc | |
| parent | powerpc/mm/radix: Prevent kernel execution of user space (diff) | |
| download | linux-f87f253bac3ce4a4eb2a60a1ae604d74e65f9042.tar.xz linux-f87f253bac3ce4a4eb2a60a1ae604d74e65f9042.zip | |
powerpc/64e: Convert cmpi to cmpwi in head_64.S
From 80f23935cadb ("powerpc: Convert cmp to cmpd in idle enter sequence"):
PowerPC's "cmp" instruction has four operands. Normally people write
"cmpw" or "cmpd" for the second cmp operand 0 or 1. But, frequently
people forget, and write "cmp" with just three operands.
With older binutils this is silently accepted as if this was "cmpw",
while often "cmpd" is wanted. With newer binutils GAS will complain
about this for 64-bit code. For 32-bit code it still silently assumes
"cmpw" is what is meant.
In this case, cmpwi is called for, so this is just a build fix for
new toolchains.
Cc: stable@vger.kernel.org # v3.0+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 451a8e1cf57b..bdb4612491a9 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -221,9 +221,9 @@ booting_thread_hwid: */ _GLOBAL(book3e_start_thread) LOAD_REG_IMMEDIATE(r5, MSR_KERNEL) - cmpi 0, r3, 0 + cmpwi r3, 0 beq 10f - cmpi 0, r3, 1 + cmpwi r3, 1 beq 11f /* If the thread id is invalid, just exit. */ b 13f @@ -248,9 +248,9 @@ _GLOBAL(book3e_start_thread) * r3 = the thread physical id */ _GLOBAL(book3e_stop_thread) - cmpi 0, r3, 0 + cmpwi r3, 0 beq 10f - cmpi 0, r3, 1 + cmpwi r3, 1 beq 10f /* If the thread id is invalid, just exit. */ b 13f |