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riscv: force hart_lottery to put in .sdata section

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In PIC code model, the zero initialized data always be put in .bss
section, so when building kernel as PIE, the hart_lottery won't present
in small data section, and it causes more than one harts to get the
lottery, because the main hart clears the content of .bss section
immediately after it getting the lottery.

Signed-off-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
[Palmer: added a comment]
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Zong Li 2020-02-04 19:19:47 +08:00 committed by Palmer Dabbelt
parent 2fab7a1560
commit aff7783392
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GPG key ID: 2E1319F35FBB1889
1 changed files with 6 additions and 2 deletions
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8
arch/riscv/kernel/setup.c
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@ -39,8 +39,12 @@ struct screen_info screen_info = {
};
#endif
/* The lucky hart to first increment this variable will boot the other cores */
atomic_t hart_lottery;
/*
* The lucky hart to first increment this variable will boot the other cores.
* This is used before the kernel initializes the BSS so it can't be in the
* BSS.
*/
atomic_t hart_lottery __section(.sdata);
unsigned long boot_cpu_hartid;
void __init parse_dtb(void)