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powerpc/32s: Remove TAUException wart in traps.c

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All 32 and 64-bit builds that don't have CONFIG_TAU_INT enabled (all
of them), get a definition of TAUException() in traps.c.

On 64-bit it's completely useless, and just wastes ~120 bytes of text.
On 32-bit it allows the kernel to link because head_32.S calls it
unconditionally.

Instead follow the example of altivec_assist_exception(), and if
CONFIG_TAU_INT is not enabled just point it at unknown_exception using
the preprocessor.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200724131728.1643966-6-mpe@ellerman.id.au
This commit is contained in:
Michael Ellerman 2020-07-24 23:17:25 +10:00
parent df4d4ef224
commit 69eeff0224
2 changed files with 4 additions and 8 deletions
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4
arch/powerpc/kernel/head_32.S
View file

@ -671,6 +671,10 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
#ifndef CONFIG_ALTIVEC
#define altivec_assist_exception unknown_exception
#endif
#ifndef CONFIG_TAU_INT
#define TAUException unknown_exception
#endif
EXCEPTION(0x1300, Trap_13, instruction_breakpoint_exception, EXC_XFER_STD)

8
arch/powerpc/kernel/traps.c
View file

@ -2060,14 +2060,6 @@ void DebugException(struct pt_regs *regs, unsigned long debug_status)
NOKPROBE_SYMBOL(DebugException);
#endif /* CONFIG_PPC_ADV_DEBUG_REGS */
#if !defined(CONFIG_TAU_INT)
void TAUException(struct pt_regs *regs)
{
printk("TAU trap at PC: %lx, MSR: %lx, vector=%lx %s\n",
regs->nip, regs->msr, regs->trap, print_tainted());
}
#endif /* CONFIG_INT_TAU */
#ifdef CONFIG_ALTIVEC
void altivec_assist_exception(struct pt_regs *regs)
{