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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-01-31 10:09:00 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-02-23 22:31:40 +1100 |
| commit | a7916a1de526162d73e894b6d3ebd895d4302078 (patch) | |
| tree | d34624a17b6475cc0e45bafdde2c6d51b6a70626 /arch/powerpc/kernel/misc_32.S | |
| parent | ed1cd6deb013a11959d17a94e35ce159197632da (diff) | |
| download | lwn-a7916a1de526162d73e894b6d3ebd895d4302078.tar.gz lwn-a7916a1de526162d73e894b6d3ebd895d4302078.zip | |
powerpc: regain entire stack space
thread_info is not anymore in the stack, so the entire stack
can now be used.
There is also no risk anymore of corrupting task_cpu(p) with a
stack overflow so the patch removes the test.
When doing this, an explicit test for NULL stack pointer is
needed in validate_sp() as it is not anymore implicitely covered
by the sizeof(thread_info) gap.
In the meantime, with the previous patch all pointers to the stacks
are not anymore pointers to thread_info so this patch changes them
to void*
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/misc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index b37b50fde828..6f6127c3760c 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -46,11 +46,10 @@ _GLOBAL(call_do_softirq) mflr r0 stw r0,4(r1) lwz r10,THREAD+KSP_LIMIT(r2) - addi r11,r3,THREAD_INFO_GAP + stw r3, THREAD+KSP_LIMIT(r2) stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) mr r1,r3 stw r10,8(r1) - stw r11,THREAD+KSP_LIMIT(r2) bl __do_softirq lwz r10,8(r1) lwz r1,0(r1) @@ -66,11 +65,10 @@ _GLOBAL(call_do_irq) mflr r0 stw r0,4(r1) lwz r10,THREAD+KSP_LIMIT(r2) - addi r11,r4,THREAD_INFO_GAP + stw r4, THREAD+KSP_LIMIT(r2) stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4) mr r1,r4 stw r10,8(r1) - stw r11,THREAD+KSP_LIMIT(r2) bl __do_irq lwz r10,8(r1) lwz r1,0(r1) |