From nobody Thu Oct 2 06:16:48 2025 Received: from fra-out-013.esa.eu-central-1.outbound.mail-perimeter.amazon.com (fra-out-013.esa.eu-central-1.outbound.mail-perimeter.amazon.com [63.178.132.221]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 31EF83002A0; Mon, 22 Sep 2025 10:34:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=63.178.132.221 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758537294; cv=none; b=Y3mdONFGPiWHWYGSVEwLPvfLi0pSQXN/PdNHXhPq6zLs9FyIjmSfgboolFT2m0XmhuAxa4CXxoNk98FT1K1X2OKeyiOLrcly8WKvfEW4izevEEmxXNm0PKkwFRoHpJPIek499IdkV3b+4C5mXCxmSoVaQ/kIraymdNtHVEc1qas= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758537294; c=relaxed/simple; bh=JZVlY5Em/rD9L4r/tEETXcDl13TBe7fZ1DB1bF+UPWE=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=FgIIZpJP7iSWRJtxKihPzvww9eefzUJA+pxRgH0auYItD2nVy4EoyMkB3wU40VfEh+VFuHqtHiuV94utMjEOVWWKpwsnmuT4Y6HnoXWWq7BYseUtkaiGbQQE/DXbRSol2x7XEIz9foX15MHsanJoHPFGqPl8+ESs1MW+koTS1TQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.com; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b=K+QZcfNJ; arc=none smtp.client-ip=63.178.132.221 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b="K+QZcfNJ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1758537292; x=1790073292; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=53eVwgGixhXV+kpfakHG+WH3ZWofjOecJWw4cVQPdGA=; b=K+QZcfNJGe78hepZbf3CGMPtzYYM7lusIVJYJYAIK1o+JhCXJVZHQ/cf D2KTtsxsKbD9Sai5IiATLNLZr4O1U8HAAAhu97f0HOhSenkbZDigFeJaZ wVRDCQfYVYQUo87YhfM5iFk7XwOYGyKYoCIuLjogD/NllDdegEcqyv7m+ //LiLlEUElFTdK9MMWceobCIgOtyJFziiwcJeFhHS1h55w8ER4ePw6SbS YZY9N9/rmYZUJ5vIMnx9hV8zOkic7lw7hsdc9OS8rd15WMDdxB3xGSbNi 2/Sqg+fwinVNmL805fHk15YN0xlZIXR7s5+245lHwiuESzNt5dlA8q8jx w==; X-CSE-ConnectionGUID: 4x3QIX9TTLS21toa+JxppA== X-CSE-MsgGUID: WjsGUbI6TSO4KI5XODdX/A== X-IronPort-AV: E=Sophos;i="6.18,284,1751241600"; d="scan'208";a="2371908" Received: from ip-10-6-3-216.eu-central-1.compute.internal (HELO smtpout.naws.eu-central-1.prod.farcaster.email.amazon.dev) ([10.6.3.216]) by internal-fra-out-013.esa.eu-central-1.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Sep 2025 10:34:38 +0000 Received: from EX19MTAEUC001.ant.amazon.com [54.240.197.225:5562] by smtpin.naws.eu-central-1.prod.farcaster.email.amazon.dev [10.0.47.2:2525] with esmtp (Farcaster) id 1d78e8a1-c17b-4606-abb5-a1fefadad1fc; Mon, 22 Sep 2025 10:34:38 +0000 (UTC) X-Farcaster-Flow-ID: 1d78e8a1-c17b-4606-abb5-a1fefadad1fc Received: from EX19D018EUA004.ant.amazon.com (10.252.50.85) by EX19MTAEUC001.ant.amazon.com (10.252.51.155) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Mon, 22 Sep 2025 10:34:29 +0000 Received: from dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (172.19.116.181) by EX19D018EUA004.ant.amazon.com (10.252.50.85) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Mon, 22 Sep 2025 10:34:04 +0000 From: Eliav Farber To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Linus Torvalds , David Laight , Lorenzo Stoakes Subject: [PATCH 03/15 6.6.y] minmax: add a few more MIN_T/MAX_T users Date: Mon, 22 Sep 2025 10:32:29 +0000 Message-ID: <20250922103241.16213-4-farbere@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250922103241.16213-1-farbere@amazon.com> References: <20250922103241.16213-1-farbere@amazon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: EX19D039UWB002.ant.amazon.com (10.13.138.79) To EX19D018EUA004.ant.amazon.com (10.252.50.85) Content-Type: text/plain; charset="utf-8" From: Linus Torvalds [ Upstream commit 4477b39c32fdc03363affef4b11d48391e6dc9ff ] Commit 3a7e02c040b1 ("minmax: avoid overly complicated constant expressions in VM code") added the simpler MIN_T/MAX_T macros in order to avoid some excessive expansion from the rather complicated regular min/max macros. The complexity of those macros stems from two issues: (a) trying to use them in situations that require a C constant expression (in static initializers and for array sizes) (b) the type sanity checking and MIN_T/MAX_T avoids both of these issues. Now, in the whole (long) discussion about all this, it was pointed out that the whole type sanity checking is entirely unnecessary for min_t/max_t which get a fixed type that the comparison is done in. But that still leaves min_t/max_t unnecessarily complicated due to worries about the C constant expression case. However, it turns out that there really aren't very many cases that use min_t/max_t for this, and we can just force-convert those. This does exactly that. Which in turn will then allow for much simpler implementations of min_t()/max_t(). All the usual "macros in all upper case will evaluate the arguments multiple times" rules apply. We should do all the same things for the regular min/max() vs MIN/MAX() cases, but that has the added complexity of various drivers defining their own local versions of MIN/MAX, so that needs another level of fixes first. Link: https://lore.kernel.org/all/b47fad1d0cf8449886ad148f8c013dae@AcuMS.ac= ulab.com/ Cc: David Laight Cc: Lorenzo Stoakes Signed-off-by: Linus Torvalds Signed-off-by: Eliav Farber --- arch/x86/mm/pgtable.c | 2 +- drivers/edac/sb_edac.c | 4 ++-- drivers/gpu/drm/drm_color_mgmt.c | 2 +- drivers/md/dm-integrity.c | 6 +++--- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +- net/ipv4/proc.c | 2 +- net/ipv6/proc.c | 2 +- 7 files changed, 10 insertions(+), 10 deletions(-) diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index b18f5a71e679..98aa303ad054 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -107,7 +107,7 @@ static inline void pgd_list_del(pgd_t *pgd) #define UNSHARED_PTRS_PER_PGD \ (SHARED_KERNEL_PMD ? KERNEL_PGD_BOUNDARY : PTRS_PER_PGD) #define MAX_UNSHARED_PTRS_PER_PGD \ - max_t(size_t, KERNEL_PGD_BOUNDARY, PTRS_PER_PGD) + MAX_T(size_t, KERNEL_PGD_BOUNDARY, PTRS_PER_PGD) =20 =20 static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm) diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c index 0c779a0326b6..6c3a40e6f4c6 100644 --- a/drivers/edac/sb_edac.c +++ b/drivers/edac/sb_edac.c @@ -109,8 +109,8 @@ static const u32 knl_interleave_list[] =3D { 0x104, 0x10c, 0x114, 0x11c, /* 20-23 */ }; #define MAX_INTERLEAVE \ - (max_t(unsigned int, ARRAY_SIZE(sbridge_interleave_list), \ - max_t(unsigned int, ARRAY_SIZE(ibridge_interleave_list), \ + (MAX_T(unsigned int, ARRAY_SIZE(sbridge_interleave_list), \ + MAX_T(unsigned int, ARRAY_SIZE(ibridge_interleave_list), \ ARRAY_SIZE(knl_interleave_list)))) =20 struct interleave_pkg { diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_m= gmt.c index d021497841b8..3969dc548cff 100644 --- a/drivers/gpu/drm/drm_color_mgmt.c +++ b/drivers/gpu/drm/drm_color_mgmt.c @@ -532,7 +532,7 @@ int drm_plane_create_color_properties(struct drm_plane = *plane, { struct drm_device *dev =3D plane->dev; struct drm_property *prop; - struct drm_prop_enum_list enum_list[max_t(int, DRM_COLOR_ENCODING_MAX, + struct drm_prop_enum_list enum_list[MAX_T(int, DRM_COLOR_ENCODING_MAX, DRM_COLOR_RANGE_MAX)]; int i, len; =20 diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index 1e27a5bce2d9..0bd76f8d4dc6 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -1794,7 +1794,7 @@ static void integrity_metadata(struct work_struct *w) struct bio *bio =3D dm_bio_from_per_bio_data(dio, sizeof(struct dm_integ= rity_io)); char *checksums; unsigned int extra_space =3D unlikely(digest_size > ic->tag_size) ? dige= st_size - ic->tag_size : 0; - char checksums_onstack[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; + char checksums_onstack[MAX_T(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; sector_t sector; unsigned int sectors_to_process; =20 @@ -2073,7 +2073,7 @@ static bool __journal_read_write(struct dm_integrity_= io *dio, struct bio *bio, } while (++s < ic->sectors_per_block); #ifdef INTERNAL_VERIFY if (ic->internal_hash) { - char checksums_onstack[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZ= E)]; + char checksums_onstack[MAX_T(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZ= E)]; =20 integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, che= cksums_onstack); if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic-= >tag_size))) { @@ -2638,7 +2638,7 @@ static void do_journal_write(struct dm_integrity_c *i= c, unsigned int write_start unlikely(from_replay) && #endif ic->internal_hash) { - char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; + char test_tag[MAX_T(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; =20 integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_= per_block), (char *)access_journal_data(ic, i, l), test_tag); diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/ne= t/ethernet/stmicro/stmmac/stmmac_main.c index ff5389a8efc3..f3155d69a013 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -2841,7 +2841,7 @@ static void stmmac_dma_interrupt(struct stmmac_priv *= priv) u32 channels_to_check =3D tx_channel_count > rx_channel_count ? tx_channel_count : rx_channel_count; u32 chan; - int status[max_t(u32, MTL_MAX_TX_QUEUES, MTL_MAX_RX_QUEUES)]; + int status[MAX_T(u32, MTL_MAX_TX_QUEUES, MTL_MAX_RX_QUEUES)]; =20 /* Make sure we never check beyond our status buffer. */ if (WARN_ON_ONCE(channels_to_check > ARRAY_SIZE(status))) diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c index a85b0aba3646..b444767b15a5 100644 --- a/net/ipv4/proc.c +++ b/net/ipv4/proc.c @@ -43,7 +43,7 @@ #include #include =20 -#define TCPUDP_MIB_MAX max_t(u32, UDP_MIB_MAX, TCP_MIB_MAX) +#define TCPUDP_MIB_MAX MAX_T(u32, UDP_MIB_MAX, TCP_MIB_MAX) =20 /* * Report socket allocation statistics [mea@utu.fi] diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c index 6d1d9221649d..752327b10dde 100644 --- a/net/ipv6/proc.c +++ b/net/ipv6/proc.c @@ -27,7 +27,7 @@ #include =20 #define MAX4(a, b, c, d) \ - max_t(u32, max_t(u32, a, b), max_t(u32, c, d)) + MAX_T(u32, MAX_T(u32, a, b), MAX_T(u32, c, d)) #define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \ IPSTATS_MIB_MAX, ICMP_MIB_MAX) =20 --=20 2.47.3