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    Contents of /trunk/kernel26-magellan/patches-2.6.16-r12/0124-2.6.16.12-broken-fp-exception.patch

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    Revision 72 - (show annotations) (download)
    Mon Jun 5 09:25:38 2006 UTC (17 years, 10 months ago) by niro
    File size: 1535 byte(s) 
    ver bump to 2.6.16-r12:
- updated to linux-2.6.16.19
- updated to ck11
    1 From: Chuck Ebbert <76306.1226@compuserve.com>
    2 Date: Sat, 29 Apr 2006 18:07:49 +0000 (-0400)
    3 Subject: [PATCH] i386: fix broken FP exception handling
    4 X-Git-Url: http://www.kernel.org/git/?p=linux/kernel/git/stable/linux-2.6.16.y.git;a=commitdiff;h=6584014ec33ed34c5bf6c5af20a0951069bea7a9
    5
    6 [PATCH] i386: fix broken FP exception handling
    7
    8 The FXSAVE information leak patch introduced a bug in FP exception
    9 handling: it clears FP exceptions only when there are already
    10 none outstanding. Mikael Pettersson reported that causes problems
    11 with the Erlang runtime and has tested this fix.
    12
    13 Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
    14 Acked-by: Mikael Pettersson <mikpe@it.uu.se>
    15 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    16 ---
    17
    18 --- a/include/asm-i386/i387.h
    19 +++ b/include/asm-i386/i387.h
    20 @@ -58,13 +58,13 @@ static inline void __save_init_fpu( stru
    21 alternative_input(
    22 "fnsave %[fx] ;fwait;" GENERIC_NOP8 GENERIC_NOP4,
    23 "fxsave %[fx]\n"
    24 - "bt $7,%[fsw] ; jc 1f ; fnclex\n1:",
    25 + "bt $7,%[fsw] ; jnc 1f ; fnclex\n1:",
    26 X86_FEATURE_FXSR,
    27 [fx] "m" (tsk->thread.i387.fxsave),
    28 [fsw] "m" (tsk->thread.i387.fxsave.swd) : "memory");
    29 /* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
    30 is pending. Clear the x87 state here by setting it to fixed
    31 - values. __per_cpu_offset[0] is a random variable that should be in L1 */
    32 + values. safe_address is a random variable that should be in L1 */
    33 alternative_input(
    34 GENERIC_NOP8 GENERIC_NOP2,
    35 "emms\n\t" /* clear stack tags */