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RISC-V: Avoid coupling the T-Head CMOs and Zicbom

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We could make the T-Head CMOs depend on a new-enough assembler to have
Zicbom, but it's not strictly necessary because the T-Head CMOs
circumvent the assembler.

Fixes: 8f7e001e03 ("RISC-V: Clean up the Zicbom block size probing")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220915170900.22685-1-palmer@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt 2022-09-15 10:09:00 -07:00
parent 762df359aa
commit c589e3ca27
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1 changed files with 5 additions and 1 deletions
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6
arch/riscv/include/asm/cacheflush.h
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@ -42,8 +42,12 @@ void flush_icache_mm(struct mm_struct *mm, bool local);
#endif /* CONFIG_SMP */
#ifdef CONFIG_RISCV_ISA_ZICBOM
/*
* The T-Head CMO errata internally probe the CBOM block size, but otherwise
* don't depend on Zicbom.
*/
extern unsigned int riscv_cbom_block_size;
#ifdef CONFIG_RISCV_ISA_ZICBOM
void riscv_init_cbom_blocksize(void);
#else
static inline void riscv_init_cbom_blocksize(void) { }