2010/10/8 Christoph Hellwig <hch@xxxxxxxxxxxxx>: > On Fri, Oct 08, 2010 at 07:03:09PM +0900, Akinobu Mita wrote: >> This introduces asm-generic header file for generic implementation of >> ext2 atomic bit operations by test_and_set_bit() and test_and_clear_bit(). >> >> alpha, arm, cris, frv, ia64, m68k, mn10300, parisc, powerpc, s390, >> sparc64, x86, xtensa can use this header file in its asm/bitops.h. > > Care to rename the functions to le_* instead of ext2_* while you're at > it and documenting their semantics? OK, as several people requested in another threads, I'll introduce little endian bit operations for all architectures and rename ext2 bitops to le bitops. BTW, I have a question about ext2 atomic bit operations. Some architectures use spinlock to implement it (asm-generic/bitops/ext2-atomic.h). Most other architectures use test_and_set_bit() and test_and_clear_bit() as this patch shows. Why are there two implementations? test_and_{set,clear}_bit() are more costly operations than spinlock for some architectures? -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html