linux-kernel - Re: [PATCH v2 2/3] riscv: module: Allocate PLT entries for R_RISCV

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Message-ID: <20250409-cf4fead4fda7b1b11bf4107d@orel>
Date: Wed, 9 Apr 2025 20:53:57 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Samuel Holland <samuel.holland@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, Alexandre Ghiti <alex@...ti.fr>, 
	linux-riscv@...ts.infradead.org, Pinkesh Vaghela <pinkesh.vaghela@...fochips.com>, 
	Pritesh Patel <pritesh.patel@...fochips.com>, Darshan Prajapati <darshan.prajapati@...fochips.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Charlie Jenkins <charlie@...osinc.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] riscv: module: Allocate PLT entries for
 R_RISCV_PLT32

On Wed, Apr 09, 2025 at 10:14:50AM -0700, Samuel Holland wrote:
> apply_r_riscv_plt32_rela() may need to emit a PLT entry for the
> referenced symbol, so there must be space allocated in the PLT.
> 
> Fixes: 8fd6c5142395 ("riscv: Add remaining module relocations")
> Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
> ---
> 
> Changes in v2:
>  - New patch for v2
> 
>  arch/riscv/kernel/module-sections.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/riscv/kernel/module-sections.c b/arch/riscv/kernel/module-sections.c
> index e264e59e596e..91d0b355ceef 100644
> --- a/arch/riscv/kernel/module-sections.c
> +++ b/arch/riscv/kernel/module-sections.c
> @@ -73,16 +73,17 @@ static bool duplicate_rela(const Elf_Rela *rela, int idx)
>  static void count_max_entries(Elf_Rela *relas, int num,
>  			      unsigned int *plts, unsigned int *gots)
>  {
> -	unsigned int type, i;
> -
> -	for (i = 0; i < num; i++) {
> -		type = ELF_RISCV_R_TYPE(relas[i].r_info);
> -		if (type == R_RISCV_CALL_PLT) {
> +	for (int i = 0; i < num; i++) {
> +		switch (ELF_R_TYPE(relas[i].r_info)) {

I see ELF_R_TYPE() is equivalent to ELF_RISCV_R_TYPE(). So OK.

> +		case R_RISCV_CALL_PLT:
> +		case R_RISCV_PLT32:
>  			if (!duplicate_rela(relas, i))
>  				(*plts)++;
> -		} else if (type == R_RISCV_GOT_HI20) {
> +			break;
> +		case R_RISCV_GOT_HI20:
>  			if (!duplicate_rela(relas, i))
>  				(*gots)++;
> +			break;
>  		}
>  	}
>  }
> -- 
> 2.47.0
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

Thanks,
drew