Messages in this thread Patches in this message | | | Date | Sat, 12 Feb 2005 11:13:49 +0100 | From | Willy Tarreau <> | Subject | [2.4.30-pre1] Sparc SMP build fixes |
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Hi Marcelo and David,
The recent addition of an smp_rmb() in kfree_skb() by Herbert Xu broke SMP builds on sparc and sparc64, but it's not Herbert's fault, it's because of a few extra semi-colons in system.h for both archs.
The smp_rmb() has been inserted this way :
if (likely(atomic_read(&skb->users) == 1)) smp_rmb(); else if (likely(!atomic_dec_and_test(&skb->users))) return;
But it's defined like this on sparc and sparc64 :
#define smp_rmb() __asm__ __volatile__("":::"memory");
So you get it :-)
I quickly grepped include/asm-* and found 85 obvious similar cases in various files and on various defines. I'm not sure that everything builds on every arch.
However, while I was fixing system.h for sparc and sparc64, I also fixed a few more defines in the same file which had the same problem. In case of sparc64, the use of "mb();" would have resulted in 3 consecutive semi-colons.
Please consider including this.
Cheers, Willy
--- ./include/asm-sparc/system.h.bad Sat Sep 18 14:15:43 2004 +++ ./include/asm-sparc/system.h Sat Feb 12 10:55:05 2005 @@ -295,9 +295,9 @@ #define wmb() mb() #define set_mb(__var, __value) do { __var = __value; mb(); } while(0) #define set_wmb(__var, __value) set_mb(__var, __value) -#define smp_mb() __asm__ __volatile__("":::"memory"); -#define smp_rmb() __asm__ __volatile__("":::"memory"); -#define smp_wmb() __asm__ __volatile__("":::"memory"); +#define smp_mb() __asm__ __volatile__("":::"memory") +#define smp_rmb() __asm__ __volatile__("":::"memory") +#define smp_wmb() __asm__ __volatile__("":::"memory") #define nop() __asm__ __volatile__ ("nop"); --- ./include/asm-sparc64/system.h.bad Sat Feb 12 10:40:21 2005 +++ ./include/asm-sparc64/system.h Sat Feb 12 10:54:17 2005 @@ -106,9 +106,9 @@ #define nop() __asm__ __volatile__ ("nop") -#define membar(type) __asm__ __volatile__ ("membar " type : : : "memory"); +#define membar(type) __asm__ __volatile__ ("membar " type : : : "memory") #define mb() \ - membar("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad"); + membar("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad") #define rmb() membar("#LoadLoad") #define wmb() membar("#StoreStore") #define set_mb(__var, __value) \ @@ -121,9 +121,9 @@ #define smp_rmb() rmb() #define smp_wmb() wmb() #else -#define smp_mb() __asm__ __volatile__("":::"memory"); -#define smp_rmb() __asm__ __volatile__("":::"memory"); -#define smp_wmb() __asm__ __volatile__("":::"memory"); +#define smp_mb() __asm__ __volatile__("":::"memory") +#define smp_rmb() __asm__ __volatile__("":::"memory") +#define smp_wmb() __asm__ __volatile__("":::"memory") #endif #define flushi(addr) __asm__ __volatile__ ("flush %0" : : "r" (addr) : "memory") @@ -132,7 +132,7 @@ /* Performance counter register access. */ #define read_pcr(__p) __asm__ __volatile__("rd %%pcr, %0" : "=r" (__p)) -#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p)); +#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p)) #define read_pic(__p) __asm__ __volatile__("rd %%pic, %0" : "=r" (__p)) /* Blackbird errata workaround. See commentary in
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