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b5636d45aa
On 32bit FS and on 64bit GS segments are already set up correctly, but load_percpu_segment() still sets [FG]S after switching from the early GDT to the direct GDT. For 32bit the segment load has no side effects, but on 64bit it causes GSBASE to become 0, which means that any per CPU access before GSBASE is set to the new value is going to fault. That's the reason why the whole file containing this code has stackprotector removed. But that's a pointless exercise for both 32 and 64 bit as the relevant segment selector is already correct. Loading the new GDT does not change that. Remove the segment loads and add comments. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20220915111143.097052006@infradead.org |
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