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From: Jisheng Zhang <jszhang@kernel.org>
To: Karl Mehltretter <kmehltretter@gmail.com>
Cc: "Paul Walmsley" <pjw@kernel.org>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	"Alexandre Ghiti" <alex@ghiti.fr>,
	"Mike Rapoport" <rppt@kernel.org>,
	"Luis Chamberlain" <mcgrof@kernel.org>,
	"Björn Töpel" <bjorn@kernel.org>,
	linux-riscv@lists.infradead.org, bpf@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] riscv: mm: Pre-allocate module page tables for execmem
Date: Sun, 15 Nov 2026 21:17:26 +0800	[thread overview]
Message-ID: <avmw5hzuVxEk__WR@xhacker> (raw)
In-Reply-To: <avgpqlpWf01mwo9P@gmail.com>

On Sat, Nov 14, 2026 at 10:29:29AM +0100, Karl Mehltretter wrote:
> On Fri, Oct 16, 2026 at 12:28:47PM +0100, Karl Mehltretter wrote:
> >   Unable to handle kernel paging request ...
> >   [ffffffff78000000] pgd=0000000000000000
> >   ...
> >   bpf_jit_fill_hole_with_zero
> >   bpf_prog_pack_alloc
> > 
> > Use CONFIG_EXECMEM for the module-range pre-allocation, as powerpc does
> > for its execmem page-table setup. Both CONFIG_MODULES and CONFIG_BPF_JIT
> > select it.
> > 
> > Fixes: 2c9e5d4a0082 ("bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of")
> > Cc: stable@vger.kernel.org
> > Assisted-by: LLM
> > Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
> > Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> > Acked-by: Björn Töpel <bjorn@kernel.org>

Reviewed-by: Jisheng Zhang <jszhang@kernel.org>

> > ---
> > Changes in v2:
> > - State that the BPF JIT region lies inside the module region (Mike).
> > - Add Acked-by tags from Mike Rapoport and Björn Töpel.
> > - No code changes from v1.
> > 
> 
> A friendly ping on v2 of this RV64 execmem page-table fix.
> 
> Is anything else needed from my side?
> 
> Thanks,
> Karl
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

WARNING: multiple messages have this Message-ID (diff)
From: Jisheng Zhang <jszhang@kernel.org>
To: Karl Mehltretter <kmehltretter@gmail.com>
Cc: "Paul Walmsley" <pjw@kernel.org>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	"Alexandre Ghiti" <alex@ghiti.fr>,
	"Mike Rapoport" <rppt@kernel.org>,
	"Luis Chamberlain" <mcgrof@kernel.org>,
	"Björn Töpel" <bjorn@kernel.org>,
	linux-riscv@lists.infradead.org, bpf@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] riscv: mm: Pre-allocate module page tables for execmem
Date: Sun, 15 Nov 2026 21:17:26 +0800	[thread overview]
Message-ID: <avmw5hzuVxEk__WR@xhacker> (raw)
In-Reply-To: <avgpqlpWf01mwo9P@gmail.com>

On Sat, Nov 14, 2026 at 10:29:29AM +0100, Karl Mehltretter wrote:
> On Fri, Oct 16, 2026 at 12:28:47PM +0100, Karl Mehltretter wrote:
> >   Unable to handle kernel paging request ...
> >   [ffffffff78000000] pgd=0000000000000000
> >   ...
> >   bpf_jit_fill_hole_with_zero
> >   bpf_prog_pack_alloc
> > 
> > Use CONFIG_EXECMEM for the module-range pre-allocation, as powerpc does
> > for its execmem page-table setup. Both CONFIG_MODULES and CONFIG_BPF_JIT
> > select it.
> > 
> > Fixes: 2c9e5d4a0082 ("bpf: remove CONFIG_BPF_JIT dependency on CONFIG_MODULES of")
> > Cc: stable@vger.kernel.org
> > Assisted-by: LLM
> > Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
> > Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> > Acked-by: Björn Töpel <bjorn@kernel.org>

Reviewed-by: Jisheng Zhang <jszhang@kernel.org>

> > ---
> > Changes in v2:
> > - State that the BPF JIT region lies inside the module region (Mike).
> > - Add Acked-by tags from Mike Rapoport and Björn Töpel.
> > - No code changes from v1.
> > 
> 
> A friendly ping on v2 of this RV64 execmem page-table fix.
> 
> Is anything else needed from my side?
> 
> Thanks,
> Karl
> 
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  reply	other threads:[~2026-11-15 13:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-16 10:28 [PATCH v2] riscv: mm: Pre-allocate module page tables for execmem Karl Mehltretter
2026-10-16 10:28 ` Karl Mehltretter
2026-11-14  9:29 ` Karl Mehltretter
2026-11-14  9:29   ` Karl Mehltretter
2026-11-15 13:17   ` Jisheng Zhang [this message]
2026-11-15 13:17     ` Jisheng Zhang

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