Messages in this thread Patch in this message | | | Date | Wed, 01 Feb 2012 12:59:50 -0800 | From | Greg KH <> | Subject | [26/89] m68k: Fix assembler constraint to prevent overeager gcc optimisation |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Andreas Schwab <schwab@linux-m68k.org>
commit 2a3535069e33d8b416f406c159ce924427315303 upstream.
Passing the address of a variable as an operand to an asm statement doesn't mark the value of this variable as used, so gcc may optimize its initialisation away. Fix this by using the "m" constraint instead.
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/m68k/atari/config.c | 8 ++++---- arch/m68k/kernel/process_mm.c | 4 ++-- arch/m68k/kernel/process_no.c | 4 ++-- arch/m68k/kernel/traps.c | 36 +++++++++++++++++------------------- arch/m68k/mm/cache.c | 6 +++--- 5 files changed, 28 insertions(+), 30 deletions(-)
--- a/arch/m68k/atari/config.c +++ b/arch/m68k/atari/config.c @@ -414,9 +414,9 @@ void __init config_atari(void) * FDC val = 4 -> Supervisor only */ asm volatile ("\n" " .chip 68030\n" - " pmove %0@,%/tt1\n" + " pmove %0,%/tt1\n" " .chip 68k" - : : "a" (&tt1_val)); + : : "m" (tt1_val)); } else { asm volatile ("\n" " .chip 68040\n" @@ -569,10 +569,10 @@ static void atari_reset(void) : "d0"); } else asm volatile ("\n" - " pmove %0@,%%tc\n" + " pmove %0,%%tc\n" " jmp %1@" : /* no outputs */ - : "a" (&tc_val), "a" (reset_addr)); + : "m" (tc_val), "a" (reset_addr)); } --- a/arch/m68k/kernel/process_mm.c +++ b/arch/m68k/kernel/process_mm.c @@ -189,8 +189,8 @@ void flush_thread(void) current->thread.fs = __USER_DS; if (!FPU_IS_EMU) asm volatile (".chip 68k/68881\n\t" - "frestore %0@\n\t" - ".chip 68k" : : "a" (&zero)); + "frestore %0\n\t" + ".chip 68k" : : "m" (zero)); } /* --- a/arch/m68k/kernel/process_no.c +++ b/arch/m68k/kernel/process_no.c @@ -163,8 +163,8 @@ void flush_thread(void) #ifdef CONFIG_FPU if (!FPU_IS_EMU) asm volatile (".chip 68k/68881\n\t" - "frestore %0@\n\t" - ".chip 68k" : : "a" (&zero)); + "frestore %0\n\t" + ".chip 68k" : : "m" (zero)); #endif } --- a/arch/m68k/kernel/traps.c +++ b/arch/m68k/kernel/traps.c @@ -552,13 +552,13 @@ static inline void bus_error030 (struct #ifdef DEBUG asm volatile ("ptestr %3,%2@,#7,%0\n\t" - "pmove %%psr,%1@" - : "=a&" (desc) - : "a" (&temp), "a" (addr), "d" (ssw)); + "pmove %%psr,%1" + : "=a&" (desc), "=m" (temp) + : "a" (addr), "d" (ssw)); #else asm volatile ("ptestr %2,%1@,#7\n\t" - "pmove %%psr,%0@" - : : "a" (&temp), "a" (addr), "d" (ssw)); + "pmove %%psr,%0" + : "=m" (temp) : "a" (addr), "d" (ssw)); #endif mmusr = temp; @@ -605,20 +605,18 @@ static inline void bus_error030 (struct !(ssw & RW) ? "write" : "read", addr, fp->ptregs.pc, ssw); asm volatile ("ptestr #1,%1@,#0\n\t" - "pmove %%psr,%0@" - : /* no outputs */ - : "a" (&temp), "a" (addr)); + "pmove %%psr,%0" + : "=m" (temp) + : "a" (addr)); mmusr = temp; printk ("level 0 mmusr is %#x\n", mmusr); #if 0 - asm volatile ("pmove %%tt0,%0@" - : /* no outputs */ - : "a" (&tlong)); + asm volatile ("pmove %%tt0,%0" + : "=m" (tlong)); printk("tt0 is %#lx, ", tlong); - asm volatile ("pmove %%tt1,%0@" - : /* no outputs */ - : "a" (&tlong)); + asm volatile ("pmove %%tt1,%0" + : "=m" (tlong)); printk("tt1 is %#lx\n", tlong); #endif #ifdef DEBUG @@ -668,13 +666,13 @@ static inline void bus_error030 (struct #ifdef DEBUG asm volatile ("ptestr #1,%2@,#7,%0\n\t" - "pmove %%psr,%1@" - : "=a&" (desc) - : "a" (&temp), "a" (addr)); + "pmove %%psr,%1" + : "=a&" (desc), "=m" (temp) + : "a" (addr)); #else asm volatile ("ptestr #1,%1@,#7\n\t" - "pmove %%psr,%0@" - : : "a" (&temp), "a" (addr)); + "pmove %%psr,%0" + : "=m" (temp) : "a" (addr)); #endif mmusr = temp; --- a/arch/m68k/mm/cache.c +++ b/arch/m68k/mm/cache.c @@ -52,9 +52,9 @@ static unsigned long virt_to_phys_slow(u unsigned long *descaddr; asm volatile ("ptestr %3,%2@,#7,%0\n\t" - "pmove %%psr,%1@" - : "=a&" (descaddr) - : "a" (&mmusr), "a" (vaddr), "d" (get_fs().seg)); + "pmove %%psr,%1" + : "=a&" (descaddr), "=m" (mmusr) + : "a" (vaddr), "d" (get_fs().seg)); if (mmusr & (MMU_I|MMU_B|MMU_L)) return 0; descaddr = phys_to_virt((unsigned long)descaddr);
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