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[72.12.199.50]) by smtp.gmail.com with ESMTPSA id u134sm1579013itb.32.2019.05.11.18.25.27 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 11 May 2019 18:25:28 -0700 (PDT) From: Alex Elder To: davem@davemloft.net, arnd@arndb.de, bjorn.andersson@linaro.org, ilias.apalodimas@linaro.org, kvalo@codeaurora.org, johannes@sipsolutions.net, andy.shevchenko@gmail.com Cc: syadagir@codeaurora.org, mjavid@codeaurora.org, evgreen@chromium.org, benchan@google.com, ejcaruso@google.com, abhishek.esse@gmail.com, linux-kernel@vger.kernel.org, Alex Elder Subject: [PATCH 01/18] bitfield.h: add FIELD_MAX() and field_max() Date: Sat, 11 May 2019 20:24:51 -0500 Message-Id: <20190512012508.10608-2-elder@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190512012508.10608-1-elder@linaro.org> References: <20190512012508.10608-1-elder@linaro.org> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Define FIELD_MAX(), which supplies the maximum value that can be represented by a field value. Define field_max() as well, to go along with the lower-case forms of the field mask functions. Signed-off-by: Alex Elder --- include/linux/bitfield.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) -- 2.20.1 diff --git a/include/linux/bitfield.h b/include/linux/bitfield.h index 3f1ef4450a7c..cf4f06774520 100644 --- a/include/linux/bitfield.h +++ b/include/linux/bitfield.h @@ -63,6 +63,19 @@ (1ULL << __bf_shf(_mask))); \ }) +/** + * FIELD_MAX() - produce the maximum value representable by a field + * @_mask: shifted mask defining the field's length and position + * + * FIELD_MAX() returns the maximum value that can be held in the field + * specified by @_mask. + */ +#define FIELD_MAX(_mask) \ + ({ \ + __BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_MAX: "); \ + (typeof(_mask))((_mask) >> __bf_shf(_mask)); \ + }) + /** * FIELD_FIT() - check if value fits in the field * @_mask: shifted mask defining the field's length and position @@ -118,6 +131,7 @@ static __always_inline u64 field_mask(u64 field) { return field / field_multiplier(field); } +#define field_max(field) ((typeof(field))field_mask(field)) #define ____MAKE_OP(type,base,to,from) \ static __always_inline __##type type##_encode_bits(base v, base field) \ { \