kevin/linux
1
Fork 0
Code

riscv: cpufeature: call match_isa_ext() for single-letter extensions

Browse Source 
Single-letter extensions may also imply multiple subextensions. For
example, Vector extension implies zve64d, and zve64d implies zve64f.

Extension parsing for "riscv,isa-extensions" has the ability to resolve
the dependency by calling match_isa_ext(). This patch makes deprecated
parser call the same function for single letter extensions.

Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240510-zve-detection-v5-3-0711bdd26c12@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andy Chiu 2024-05-10 00:26:53 +08:00 committed by Palmer Dabbelt
parent 38a94c4666
commit 98a5700dfa
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
1 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/riscv/kernel/cpufeature.c
View File

@ -468,16 +468,15 @@ static void __init riscv_parse_isa_string(unsigned long *this_hwcap, struct risc
if (unlikely(ext_err))
continue;
for (int i = 0; i < riscv_isa_ext_count; i++)
match_isa_ext(&riscv_isa_ext[i], ext, ext_end, isainfo);
if (!ext_long) {
int nr = tolower(*ext) - 'a';
if (riscv_isa_extension_check(nr)) {
if (riscv_isa_extension_check(nr))
*this_hwcap |= isa2hwcap[nr];
set_bit(nr, isainfo->isa);
}
} else {
for (int i = 0; i < riscv_isa_ext_count; i++)
match_isa_ext(&riscv_isa_ext[i], ext, ext_end, isainfo);
}
}
}