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From: Paul Walmsley <pjw@kernel.org>
To: Michael Neuling <mikey@neuling.org>
Cc: "Björn Töpel" <bjorn@rivosinc.com>,
	"Mike Rapoport (Microsoft)" <rppt@kernel.org>,
	"Vishal Moola (Oracle)" <vishal.moola@gmail.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	"Aleksa Paunovic" <aleksa.paunovic@htecgroup.com>,
	"Aleksandar Rikalo" <arikalo@gmail.com>,
	"Alexandre Ghiti" <alex@ghiti.fr>,
	"Andrew Jones" <ajones@ventanamicro.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"David Hildenbrand" <david@redhat.com>,
	"Djordje Todorovic" <djordje.todorovic@htecgroup.com>,
	"Guo Ren" <guoren@kernel.org>,
	"Junhui Liu" <junhui.liu@pigmoral.tech>,
	"Kevin Brodsky" <kevin.brodsky@arm.com>,
	"Lorenzo Stoakes" <ljs@kernel.org>,
	"Nam Cao" <namcao@linutronix.de>,
	"Oleg Nesterov" <oleg@redhat.com>,
	"Oscar Salvador" <osalvador@suse.de>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Paul Walmsley" <pjw@kernel.org>,
	"Qinglin Pan" <panqinglin2020@iscas.ac.cn>,
	"Raj Vishwanathan4" <rvishwanathan@mips.com>,
	linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org
Subject: Re: [PATCH 1/5] riscv: errata: Fix bitwise vs logical AND in MIPS errata patching
Date: Thu, 30 Apr 2026 20:08:26 -0600 (MDT)	[thread overview]
Message-ID: <f860d596-27e9-4c3c-71dc-a2c382feab30@kernel.org> (raw)
In-Reply-To: <20260409091143.1348853-2-mikey@neuling.org>

On Thu, 9 Apr 2026, Michael Neuling wrote:

> The condition checking whether a specific errata needs patching uses
> logical AND (&&) instead of bitwise AND (&). Since logical AND only
> checks that both operands are non-zero, this causes all errata patches
> to be applied whenever any single errata is detected, rather than only
> applying the matching one.
> 
> The SiFive errata implementation correctly uses bitwise AND for the same
> check.
> 
> Fixes: 0b0ca959d2 ("riscv: errata: Fix the PAUSE Opcode for MIPS P8700")
> Signed-off-by: Michael Neuling <mikey@neuling.org>
> Assisted-by: Cursor:claude-4.6-opus-high-thinking

Thanks, after fixing the checkpatch warning regarding the Fixes: line in 
the patch description, queued for v7.1-rc.


- Paul

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WARNING: multiple messages have this Message-ID (diff)
From: Paul Walmsley <pjw@kernel.org>
To: Michael Neuling <mikey@neuling.org>
Cc: "Björn Töpel" <bjorn@rivosinc.com>,
	"Mike Rapoport (Microsoft)" <rppt@kernel.org>,
	"Vishal Moola (Oracle)" <vishal.moola@gmail.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	"Aleksa Paunovic" <aleksa.paunovic@htecgroup.com>,
	"Aleksandar Rikalo" <arikalo@gmail.com>,
	"Alexandre Ghiti" <alex@ghiti.fr>,
	"Andrew Jones" <ajones@ventanamicro.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"David Hildenbrand" <david@redhat.com>,
	"Djordje Todorovic" <djordje.todorovic@htecgroup.com>,
	"Guo Ren" <guoren@kernel.org>,
	"Junhui Liu" <junhui.liu@pigmoral.tech>,
	"Kevin Brodsky" <kevin.brodsky@arm.com>,
	"Lorenzo Stoakes" <ljs@kernel.org>,
	"Nam Cao" <namcao@linutronix.de>,
	"Oleg Nesterov" <oleg@redhat.com>,
	"Oscar Salvador" <osalvador@suse.de>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Paul Walmsley" <pjw@kernel.org>,
	"Qinglin Pan" <panqinglin2020@iscas.ac.cn>,
	"Raj Vishwanathan4" <rvishwanathan@mips.com>,
	linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org
Subject: Re: [PATCH 1/5] riscv: errata: Fix bitwise vs logical AND in MIPS errata patching
Date: Thu, 30 Apr 2026 20:08:26 -0600 (MDT)	[thread overview]
Message-ID: <f860d596-27e9-4c3c-71dc-a2c382feab30@kernel.org> (raw)
In-Reply-To: <20260409091143.1348853-2-mikey@neuling.org>

On Thu, 9 Apr 2026, Michael Neuling wrote:

> The condition checking whether a specific errata needs patching uses
> logical AND (&&) instead of bitwise AND (&). Since logical AND only
> checks that both operands are non-zero, this causes all errata patches
> to be applied whenever any single errata is detected, rather than only
> applying the matching one.
> 
> The SiFive errata implementation correctly uses bitwise AND for the same
> check.
> 
> Fixes: 0b0ca959d2 ("riscv: errata: Fix the PAUSE Opcode for MIPS P8700")
> Signed-off-by: Michael Neuling <mikey@neuling.org>
> Assisted-by: Cursor:claude-4.6-opus-high-thinking

Thanks, after fixing the checkpatch warning regarding the Fixes: line in 
the patch description, queued for v7.1-rc.


- Paul

  reply	other threads:[~2026-05-01  2:08 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-09  9:11 [PATCH 0/5] riscv: Assorted bug fixes Michael Neuling
2026-04-09  9:11 ` Michael Neuling
2026-04-09  9:11 ` [PATCH 1/5] riscv: errata: Fix bitwise vs logical AND in MIPS errata patching Michael Neuling
2026-04-09  9:11   ` Michael Neuling
2026-05-01  2:08   ` Paul Walmsley [this message]
2026-05-01  2:08     ` Paul Walmsley
2026-04-09  9:11 ` [PATCH 2/5] riscv: ptrace: Fix register corruption in compat_riscv_gpr_set on error Michael Neuling
2026-04-09  9:11   ` Michael Neuling
2026-05-01  2:05   ` Paul Walmsley
2026-05-01  2:05     ` Paul Walmsley
2026-05-01  6:21     ` Michael Neuling
2026-05-01  6:21       ` Michael Neuling
2026-05-01  6:23     ` [PATCH v2] riscv: Fix register corruption from uninitialized cregs " Michael Neuling
2026-05-01  6:23       ` Michael Neuling
2026-05-02  3:14       ` Paul Walmsley
2026-05-02  3:14         ` Paul Walmsley
2026-04-09  9:11 ` [PATCH 3/5] riscv: mm: Fix NULL pointer dereference in __set_memory Michael Neuling
2026-04-09  9:11   ` Michael Neuling
2026-04-09 12:37   ` David Hildenbrand (Arm)
2026-04-09 12:37     ` David Hildenbrand (Arm)
2026-04-10  6:23     ` Michael Neuling
2026-04-10  6:23       ` Michael Neuling
2026-04-10  7:42       ` David Hildenbrand (Arm)
2026-04-10  7:42         ` David Hildenbrand (Arm)
2026-04-10  7:53         ` Mike Rapoport
2026-04-10  7:53           ` Mike Rapoport
2026-04-10  7:59           ` David Hildenbrand (Arm)
2026-04-10  7:59             ` David Hildenbrand (Arm)
2026-04-10  8:55             ` Michael Neuling
2026-04-10  8:55               ` Michael Neuling
2026-04-09  9:11 ` [PATCH 4/5] riscv: mm: Fix NULL dereferences in napot hugetlb functions Michael Neuling
2026-04-09  9:11   ` Michael Neuling
2026-04-09 12:36   ` David Hildenbrand (Arm)
2026-04-09 12:36     ` David Hildenbrand (Arm)
2026-04-09  9:11 ` [PATCH 5/5] riscv: mm: Fix TOCTOU race in remove_pte_mapping Michael Neuling
2026-04-09  9:11   ` Michael Neuling
2026-04-09 12:32   ` David Hildenbrand (Arm)
2026-04-09 12:32     ` David Hildenbrand (Arm)

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