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powerpc: remove partial register save logic

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All subarchitectures always save all GPRs to pt_regs interrupt frames
now. Remove FULL_REGS and associated bits.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210316104206.407354-11-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2021-03-16 20:42:04 +10:00
committed by Michael Ellerman
parent c45ba4f44f
commit 8dc7f0229b
12 changed files with 10 additions and 90 deletions
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12
arch/powerpc/kernel/process.c
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@@ -1448,11 +1448,9 @@ static void print_msr_bits(unsigned long val)
#ifdef CONFIG_PPC64
#define REG "%016lx"
#define REGS_PER_LINE 4
#define LAST_VOLATILE 13
#else
#define REG "%08lx"
#define REGS_PER_LINE 8
#define LAST_VOLATILE 12
#endif
static void __show_regs(struct pt_regs *regs)
@@ -1488,8 +1486,6 @@ static void __show_regs(struct pt_regs *regs)
if ((i % REGS_PER_LINE) == 0)
pr_cont("\nGPR%02d: ", i);
pr_cont(REG " ", regs->gpr[i]);
if (i == LAST_VOLATILE && !FULL_REGS(regs))
break;
}
pr_cont("\n");
/*
@@ -1692,7 +1688,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
} else {
/* user thread */
struct pt_regs *regs = current_pt_regs();
CHECK_FULL_REGS(regs);
*childregs = *regs;
if (usp)
childregs->gpr[1] = usp;
@@ -1797,13 +1792,6 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
regs->ccr = 0;
regs->gpr[1] = sp;
/*
* We have just cleared all the nonvolatile GPRs, so make
* FULL_REGS(regs) return true. This is necessary to allow
* ptrace to examine the thread immediately after exec.
*/
SET_FULL_REGS(regs);
#ifdef CONFIG_PPC32
regs->mq = 0;
regs->nip = start;