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SubjectAtomic test and set patches (was Re: ppp and other problems)
Date
Steve Blackburn wrote:
> The problem is that ppp.c uses set_bit, which is word-based, to set
> byte values. This is a clear bug -- however, it works OK (by good
> luck) on the little endian machines, as only the least significant bit
> is touched. On a big endian machine things don't work out so well
> :-). My temorary hack is to add set_bit_byte and get_bit_byte
> routines (thanks to Tridge for helping me get the bug out a few weeks
> ago).

It seems clear to me that things would be much cleaner with a real
test and set routine instead of using set_bit(0,...) directly. It
also happens that we can actually do this atomically on the Sparc
without resorting to turning off interrupts.

The following patch adds such a test and set primitive to <asm/atomic.h>
for platforms I am familiar with, and in all places I could identify
that a set_bit(0,...) was used as a lone flag, made the appropriate
modifications.

The t&s primitive is simply defined to set the argument to non-zero
(not 1!). This also means that for proper operation, the only two
values that can safely be assigned to such a lock are 0 and -1; using
1 is not sufficient, because, e.g., on m68k and sparc the high-order
bit(s) is set and the low-order bit is not examined at all.

To the i386 users, can yall check that I didn't make any typos in
your drivers, and check that I didn't miss any 1 -> -1 changes?


r~
------
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Steve Blackburn wrote:
> The problem is that ppp.c uses set_bit, which is word-based, to set
> byte values. This is a clear bug -- however, it works OK (by good
> luck) on the little endian machines, as only the least significant bit
> is touched. On a big endian machine things don't work out so well
> :-). My temorary hack is to add set_bit_byte and get_bit_byte
> routines (thanks to Tridge for helping me get the bug out a few weeks
> ago).

It seems clear to me that things would be much cleaner with a real
test and set routine instead of using set_bit(0,...) directly. It
also happens that we can actually do this atomically on the Sparc
without resorting to turning off interrupts.

The following patch adds such a test and set primitive to <asm/atomic.h>
for platforms I am familiar with, and in all places I could identify
that a set_bit(0,...) was used as a lone flag, made the appropriate
modifications.

The t&s primitive is simply defined to set the argument to non-zero
(not 1!). This also means that for proper operation, the only two
values that can safely be assigned to such a lock are 0 and -1; using
1 is not sufficient, because, e.g., on m68k and sparc the high-order
bit(s) is set and the low-order bit is not examined at all.

To the i386 users, can yall check that I didn't make any typos in
your drivers, and check that I didn't miss any 1 -> -1 changes?


r~
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end

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