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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jul 2025 05:13:58.5187 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9466dca4-7eca-4257-6a51-08ddc35e676e X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF00000041.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB8721 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250714_221404_783475_B31267E4 X-CRM114-Status: GOOD ( 15.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 11/07/25 9:47 pm, Will Deacon wrote: > Since commit e2768b798a19 ("arm64/mm: Modify range-based tlbi to > decrement scale"), we don't need to clamp the 'pages' argument to fit > the range for the specified 'scale' as we know that the upper bits will > have been processed in a prior iteration. > > Drop the clamping and simplify the __TLBI_RANGE_NUM() macro. > > Signed-off-by: Will Deacon Just for the sake of it: It is easy to check that for natural numbers x and y, x < (((x >> y) + 1) << y) This implies x < ((x >> y) << y) + (1 << y) => x - ((x >> y) << y) < (1 << y) Substitute x as pages, and y as 5 * scale + 1, the inequation means that after the first iteration, the new value of pages will be strictly less than 1 << (5 * scale + 1) => the current scale won't be repeated => the min is redundant. Reviewed-by: Dev Jain > --- > arch/arm64/include/asm/tlbflush.h | 6 +----- > 1 file changed, 1 insertion(+), 5 deletions(-) > > diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h > index ddd77e92b268..a8d21e52ef3a 100644 > --- a/arch/arm64/include/asm/tlbflush.h > +++ b/arch/arm64/include/asm/tlbflush.h > @@ -205,11 +205,7 @@ static __always_inline void __tlbi_level(const enum tlbi_op op, u64 addr, u32 le > * range. > */ > #define __TLBI_RANGE_NUM(pages, scale) \ > - ({ \ > - int __pages = min((pages), \ > - __TLBI_RANGE_PAGES(31, (scale))); \ > - (__pages >> (5 * (scale) + 1)) - 1; \ > - }) > + (((pages) >> (5 * (scale) + 1)) - 1) > > /* > * TLB Invalidation