From: Stelian Pop Date: Thu, 15 Mar 2007 15:54:27 +0000 (+0100) Subject: [ARM] 4264/1: ldrex/strex syntax errors with recent compilers X-Git-Tag: firefly_0821_release~30535^2~5 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0803c30c23d39e1db88d06ef59c30fa5ef6c3ada;p=firefly-linux-kernel-4.4.55.git [ARM] 4264/1: ldrex/strex syntax errors with recent compilers Trying to build some code using atomic_clear_mask() on a ARM v6 processor with a recent compiler (tried with gcc version 4.1.1 (CodeSourcery ARM Sourcery G++ 2006q3-26), but all gcc > 4.1 might be affected) results in the following: /tmp/ccWKLJV8.s: Assembler messages: /tmp/ccWKLJV8.s:581: Error: instruction does not accept this addressing mode -- `ldrex r0,r3' /tmp/ccWKLJV8.s:583: Error: instruction does not accept this addressing mode -- `strex r1,r0,r3' Older gcc (like gcc version 4.0.0 (DENX ELDK 4.1 4.0.0)) have no problem with this. The patch below fixes the compile error. I also verified that gcc-4.0.0 generates identical code using both forms. Signed-off-by: Stelian Pop Acked-by: Catalin Marinas Signed-off-by: Russell King --- diff --git a/include/asm-arm/atomic.h b/include/asm-arm/atomic.h index ea88aa6bfc78..f266c2795124 100644 --- a/include/asm-arm/atomic.h +++ b/include/asm-arm/atomic.h @@ -103,9 +103,9 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr) unsigned long tmp, tmp2; __asm__ __volatile__("@ atomic_clear_mask\n" -"1: ldrex %0, %2\n" +"1: ldrex %0, [%2]\n" " bic %0, %0, %3\n" -" strex %1, %0, %2\n" +" strex %1, %0, [%2]\n" " teq %1, #0\n" " bne 1b" : "=&r" (tmp), "=&r" (tmp2)