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commit 3d235455bb1f579c725280de1803e2d95894998a
Author: Damien Zammit <[email protected]>
Date: Thu Jan 8 08:37:39 2026 +0000
x86_64/cswitch: Don't clobber %rax with cpu number
Since a thread is supposed to be returned from Switch_context,
this fixes a bug where the thread is always returned as 0x0 on 64b UP,
hence the idle thread was being called too often instead of a chosen thread.
Also, this fixes a potential future bug with 64b SMP where the non-zero
cpu number is returned as a valid thread and causes a crash.
TESTED: By compiling gnumach on hurd-amd64 with
--enable-ncpus=1 --disable-linux-groups --enable-kdb --enable-apic
and booting hurd-amd64 in UP on qemu.
Message-ID: <[email protected]>
-----------------------------------------------------------------------
Summary of changes:
x86_64/cswitch.S | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
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GNU Mach
