linux-kernel - [RFC PATCH V2 10/38] riscv: u64ilp32: Remove the restriction of UXL=32

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Message-Id: <20231112061514.2306187-11-guoren@kernel.org>
Date:   Sun, 12 Nov 2023 01:14:46 -0500
From:   guoren@...nel.org
To:     arnd@...db.de, guoren@...nel.org, palmer@...osinc.com,
        tglx@...utronix.de, conor.dooley@...rochip.com, heiko@...ech.de,
        apatel@...tanamicro.com, atishp@...shpatra.org, bjorn@...nel.org,
        paul.walmsley@...ive.com, anup@...infault.org, jiawei@...as.ac.cn,
        liweiwei@...as.ac.cn, wefu@...hat.com, U2FsdGVkX1@...il.com,
        wangjunqiang@...as.ac.cn, kito.cheng@...ive.com,
        andy.chiu@...ive.com, vincent.chen@...ive.com,
        greentime.hu@...ive.com, wuwei2016@...as.ac.cn, jrtc27@...c27.com,
        luto@...nel.org, fweimer@...hat.com, catalin.marinas@....com,
        hjl.tools@...il.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [RFC PATCH V2 10/38] riscv: u64ilp32: Remove the restriction of UXL=32

From: Guo Ren <guoren@...ux.alibaba.com>

The u64ilp32 needn't hardware support UXL=32, so remove the
restriction when EF_RISCV_64ILP32 is detected.

Reported-by: Junqiang Wang <wangjunqiang@...as.ac.cn>
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
 arch/riscv/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index e32d737e039f..93057ca2e2a7 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -88,7 +88,7 @@ static bool compat_mode_supported __read_mostly;
 
 bool compat_elf_check_arch(Elf32_Ehdr *hdr)
 {
-	return compat_mode_supported &&
+	return (compat_mode_supported || (hdr->e_flags & EF_RISCV_64ILP32)) &&
 	       hdr->e_machine == EM_RISCV &&
 	       hdr->e_ident[EI_CLASS] == ELFCLASS32;
 }
-- 
2.36.1