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powerpc/irq: Use current_stack_pointer in do_IRQ()

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Until commit 7306e83ccf ("powerpc: Don't use CURRENT_THREAD_INFO to
find the stack"), the current stack base address was obtained by
calling current_thread_info(). That inline function was simply masking
out the value of r1.

In that commit, it was changed to using current_stack_pointer() (since
renamed current_stack_frame()), which is a heavier function as it is
an outline assembly function which cannot be inlined and which reads
the content of the stack at 0(r1).

Convert to using current_stack_pointer for geting r1 and masking out
its value to obtain the base address of the stack pointer as before.

Fixes: 7306e83ccf ("powerpc: Don't use CURRENT_THREAD_INFO to find the stack")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200220115141.2707-5-mpe@ellerman.id.au
This commit is contained in:
Christophe Leroy 2020-02-20 22:51:41 +11:00 committed by Michael Ellerman
parent 0dec6e1cca
commit 532d43a73c
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/irq.c
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@ -648,7 +648,7 @@ void do_IRQ(struct pt_regs *regs)
void *cursp, *irqsp, *sirqsp;
/* Switch to the irq stack to handle this */
cursp = (void *)(current_stack_frame() & ~(THREAD_SIZE - 1));
cursp = (void *)(current_stack_pointer & ~(THREAD_SIZE - 1));
irqsp = hardirq_ctx[raw_smp_processor_id()];
sirqsp = softirq_ctx[raw_smp_processor_id()];